WNr 1.7182 Alloy Steel Bar 1.7182 Round Bars 1.7182 Rods

Product Description

WNr 1.7182 (also designated as 27MnCrB5-2) is a high-strength, boron-alloyed quenching and tempering steel. It is specifically designed for components requiring high wear resistance and mechanical strength, often serving as a more cost-effective alternative to higher-alloyed chrome-molybdenum steels.

1. Chemical Composition

The "B" in its designation signifies the addition of Boron, which significantly enhances the steel's hardenability even in small amounts.

2. Mechanical Properties (Typical)

Properties vary based on the heat treatment (Normalized vs. Quenched & Tempered) and the diameter of the bar.

• Tensile Strength ($R_m$): 900 – 1150 MPa (in QT condition)

• Yield Strength ($R_e$):$\ge$ 700 – 850 MPa

• Elongation ($A_5$):$\ge$ 12%

• Hardness (Quenched): Can reach 48–52 HRC before tempering.

• Impact Energy (KV):$\ge$ 30–60 J (depending on temperature and condition).

3. Key Technical Features

• Hardenability: Due to the boron content, 1.7182 achieves a high core hardness in larger cross-sections compared to standard carbon steels.

• Wear Resistance: Excellent surface durability after heat treatment, making it ideal for abrasive environments.

• Weldability: Moderate. While weldable, it generally requires preheating and post-weld heat treatment to prevent cracking due to its hardenability.

• Machinability: Fair to good in the annealed or normalized state, but becomes difficult once hardened.

4. Global Equivalents

5. Common Applications

1.7182 round bars and rods are primarily used for high-stress mechanical parts:

• Automotive: Crankshafts, connecting rods, axle journals, and steering components.

• Agriculture: Plowshares, harrow discs, and other soil-engaging tools (due to wear resistance).

• Fasteners: High-tensile bolts and heavy-duty screws.

• Engineering: Gears, rollers, and bushings subjected to high loads.

Available Forms

• Round Bars: Typically available from 10mm to 300mm+ in diameter.

• Rods: Often supplied in cold-drawn or hot-rolled conditions.

• Finish: Black (hot-rolled), Peeled, or Polished (h9/h11 tolerances).